Nature has three ways to dispose of Organic Waste, which includes us. Natural aerobic decomposition, Rot and Fire, shame we major on the last two which keeps carbon in the atmosphere. Microbes are there for a reason exchanging minerals and nutrients for liquid carbon, sugars, carbohydrates and protean produced through the magic of photosynthesis. We must all understand soil microbes if we want to leave this planet in a better state when we die.
http://grist.org/science/urban-soil-emits-a-surprising-amount-of-co2/